Although considerable research efforts have been devoted to the design and development of non-noble electrocatalysts for oxygen evolution reaction(OER), substantial enhancement of OER performance with commercial-scale...Although considerable research efforts have been devoted to the design and development of non-noble electrocatalysts for oxygen evolution reaction(OER), substantial enhancement of OER performance with commercial-scale water electrolysis remains a big challenge. This could result from the difficulties in detecting the intrinsic properties and overlooking the assembly process for electrochemical OER process. Here, we employ a microjet collision method to investigate the intrinsic OER activities of individual NiZnFeO_x entities with and without a moderate magnetic field. Our results demonstrate that single NiZnFeO_x nanoparticles(NPs) show the excellent OER performance with a lowest onset potential(~1.35 V vs. RHE) and a greatest magnetic enhancement(~118%) among bulk materials, single agglomerations and NPs. Furthermore, we explore the utility of theoretical investigation by density functional theory(DFT)calculations for studying OER process on NiZnFeO_x surfaces without and with spin alignment, indicating monodispersed NiZnFeO_xNPs with totally spin alignment facilitates the OER process under the external magnetic field. It is found that the well-dispersion of NiZnFeO_x NPs would increase the electrical conductivity and the surface spin state, resulting in promoting their OER activities. This work provides a test for uncovering the essential roles of NPs assembly to a significant promotion of their magnet-assisted OER.展开更多
Ensemble averaging measurements obscure the link between the electrochemical performance and the specific properties of an individual because of the interplay of inhomogeneity and heterogeneity.Nanocollision electroch...Ensemble averaging measurements obscure the link between the electrochemical performance and the specific properties of an individual because of the interplay of inhomogeneity and heterogeneity.Nanocollision electrochemistry has attracted increasing interest because of its extremely high sensitivity,revealing the intrinsic properties of individual entities that are masked in the traditional ensemble measurements.In this perspective review,we summarized the recent developments in nanocollision-based single entity electrochemistry and photoelectrochemistry,the combined nanocollision electrochemistry with the other complementary techniques,as well as accurate data process.In closing,future challenges,opportunities,and destinations related to nanocollison electrochemistry were discussed.展开更多
基金supported by the Major Research Project (No.92061108)the National Natural Science Foundation of China (No.22272052)+2 种基金Shanghai Municipal Science and Technology Major Project (No.2018SHZDZX03)Xiamen University Opening Project of PCOSS (No.201901)Yongjiang Talent Introduction Programme(No.2021A-115-G)。
文摘Although considerable research efforts have been devoted to the design and development of non-noble electrocatalysts for oxygen evolution reaction(OER), substantial enhancement of OER performance with commercial-scale water electrolysis remains a big challenge. This could result from the difficulties in detecting the intrinsic properties and overlooking the assembly process for electrochemical OER process. Here, we employ a microjet collision method to investigate the intrinsic OER activities of individual NiZnFeO_x entities with and without a moderate magnetic field. Our results demonstrate that single NiZnFeO_x nanoparticles(NPs) show the excellent OER performance with a lowest onset potential(~1.35 V vs. RHE) and a greatest magnetic enhancement(~118%) among bulk materials, single agglomerations and NPs. Furthermore, we explore the utility of theoretical investigation by density functional theory(DFT)calculations for studying OER process on NiZnFeO_x surfaces without and with spin alignment, indicating monodispersed NiZnFeO_xNPs with totally spin alignment facilitates the OER process under the external magnetic field. It is found that the well-dispersion of NiZnFeO_x NPs would increase the electrical conductivity and the surface spin state, resulting in promoting their OER activities. This work provides a test for uncovering the essential roles of NPs assembly to a significant promotion of their magnet-assisted OER.
基金supported by the National Natural Science Foundation of China (21775043, 21421004)the Program of Introducing Talents of Discipline to Universities (B16017)+1 种基金Innovation Program of Shanghai Municipal Education Commission (2017-01-07-00-02E00023)the Fundamental Research Funds for the Central Universities (222201718001, 222201717003)
文摘Ensemble averaging measurements obscure the link between the electrochemical performance and the specific properties of an individual because of the interplay of inhomogeneity and heterogeneity.Nanocollision electrochemistry has attracted increasing interest because of its extremely high sensitivity,revealing the intrinsic properties of individual entities that are masked in the traditional ensemble measurements.In this perspective review,we summarized the recent developments in nanocollision-based single entity electrochemistry and photoelectrochemistry,the combined nanocollision electrochemistry with the other complementary techniques,as well as accurate data process.In closing,future challenges,opportunities,and destinations related to nanocollison electrochemistry were discussed.
